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s49525 Sound Moving Control for Home Theater Applications1) Sergey Novikov, 2) Sergey Grigoriev, 3) Dmitry Elyashev2) Russian Ac. Sci. State Oceanology Institute, Moscow, Russia 3) Film Director, Producer, Moscow, Russia
Fast algorithms for accurate sound localization in space are
proposed. They are based on approximation of summary sound spectrum,
obtained from 5 speakers, to one which must be percepted from virtual
source placed at given point in space. The appropriate software allows
to avoid using of an expensive hardware, the same accuracy being
provided. The proposed virtual source simulation algorithm is based on
the following assumptions: a) a considerably narrow frequency band can
be locally represented by a single sine function; b) the third
component (height) of the virtual sound source is defined by
reflection and some other spectral features that are intrinsic to
initial signal. Monte-Carlo method was used to get regularized
solution. We developed compact software that allow to make complete
calculations for the whole 40 sqr.m. grid with 12 cm. step in 0.2-1.5
min. on Pentium II, depending on accuracy. After these short
preliminary calculations, any path or localization of sound can be
defined in real play time on Pentium II, final construction taking
0.2-1 min. for 10 sec. of sounding. The input data for this software
is a standard mono WAV-file with 44100 smpl/sec, and output are 5
WAV-files which could be played simultaneously on 5 speakers. For this
purpose we used GINA sound card (ECHO Corp.). The proposed method was
specially designed and applied for certain art projects (video and
music), we assume to demonstrate the corresponding results.
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Last modified: 12.03.1999 aes16@acoustics.hut.fi